Probe for ultrasonic diagnostic apparatus

ABSTRACT

A probe for an ultrasonic diagnostic apparatus which is used for performing a test upon a subject is provided. The probe includes a case which forms an exterior of the probe, a piezoelectric object which is provided on an inside of the case and which generates an ultrasonic wave, a sound absorbing layer which is provided at a rear surface of the piezoelectric object and which prevents the ultrasonic wave from being delivered to a rear portion of the piezoelectric object, an acoustic matching layer which delivers the generated ultrasonic wave to a subject by matching a sound impedance of the piezoelectric object with a sound impedance of the subject, and a sound lens which concentrates the generated ultrasonic wave and radiates the concentrated ultrasonic wave toward the subject.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation of application Ser. No. 13/712,132 filed Dec. 12,2012, which claims priority from Korean Patent Application No.10-2011-0133504, filed on Dec. 13, 2011 in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein byreference in its entirety.

BACKGROUND

1. Field

Exemplary embodiments relate to a probe for use in conjunction with anultrasonic diagnostic apparatus, and more particularly, to a probe foruse in conjunction with an ultrasonic diagnostic apparatus which iscapable of performing a test by closely adhering to a particular portionof a test subject.

2. Description of the Related Art

In general, an ultrasonic diagnostic apparatus is an apparatus which isconfigured to radiate an ultrasonic signal toward a desired portion atan inside of a body from the surface of a subject and to obtain an imagewith reference to a cross section of a soft tissue or a blood flow byusing the information included in the reflected ultrasonic signal in annon-invasive manner. The apparatus as such, as compared with otherdisplay apparatuses such as an X-ray photographing apparatus, a CTapparatus (Computerized Tomography Scanner), an MRI (Magnetic ResonanceImage), or a nuclear medical diagnostic device, is smaller in size, lessexpensive, and capable of displaying images obtained in real time, andis not exposed to radiation of an X-ray, and thus relatively safer,thereby being used widely for the diagnosis of medical conditionsrelating to hearts, abdomens, genital organs, and in gynecology.

In particular, an ultrasonic diagnostic apparatus includes a probe whichis configured to transmit an ultrasonic signal to a subject in order toobtain an ultrasonic image of the subject and to receive an echo signalthat is reflected from the subject.

A probe includes a transducer, a case which is provided with an openupper end thereof, and a cover portion which is coupled to the openupper end of the case in order to directly contact with a surface of thesubject.

A transducer includes a piezoelectric layer which is configured toreciprocally change an electrical signal and a sound signal as apiezoelectric object vibrates, an acoustic matching layer which isconfigured to reduce a difference of a sound impedance between thepiezoelectric layer and the subject so that the ultrasonic wavegenerated at the piezoelectric layer is delivered primarily to thesubject, a lens layer which is configured to concentrate the ultrasonicwave which proceeds to a front portion of the piezoelectric layer to acertain position, and a sound absorbing layer which is configured toreduce a distortion of an image by preventing the ultrasonic wave fromproceeding to a rear portion of the piezoelectric layer.

A probe which is configured for use in conjunction with an ultrasonicdiagnostic apparatus includes at least one of a concave-type probe whichis used for a diagnosis relating to an abdomen and which has a concavesurface thereof, a linear-type probe which is used for a diagnosisrelating to one or more of breasts, a thyroid, and testicles and whichhas a flat surface thereof, an endocavity-type probe which is used for adiagnosis relating to a uterus and an ovary, and a hockey stick-typeprobe.

A muscular skeletal system (for example, shoulders and knees) having acurved surface thereof may not be convenient for using a linear-typeprobe provided with a flat surface thereof, as a footprint of the probehas a length which falls approximately within a range of between 40 mmand 50 mm, and thus the probe may not closely adhere to the curvedsurface of the subject. Therefore, multiple uses of a probe having asmall footprint, such as a hockey stick probe, are required in order toperform a scan, and in a case in which a probe other than a linear-typeprobe is used, the probe may not be closely in contact with the subject,as the body figure of the subject and the shape of a probe may not be incorrespondence to each other.

In addition, when an ultrasonic test is performed, an ultrasonic wavedoes not penetrate a bone and air, so in a case in which a probeconfigured for an ultrasonic diagnostic apparatus directly contacts theskin of the subject, the collection of data is not possible. Thus, in acase in which an ultrasonic wave diagnosis is being performed, a liquidis typically applied on the skin in order to eject the air which issituated in between the probe and the skin of the subject, or a padprovided with a liquid applied thereon is used.

SUMMARY

Therefore, it is an aspect of exemplary embodiments described herein toprovide a probe which is configured for use in conjunction with anultrasonic diagnostic apparatus that may be used for a diagnosis of amedical condition relating to a muscular skeletal system of a subject.

Additional aspects of the exemplary embodiments will be set forth inpart in the description which follows and, in part, will be obvious fromthe description, or may be learned by practice of the exemplaryembodiments.

In accordance with one aspect of one or more exemplary embodiments, aprobe for use in conjunction with an ultrasonic diagnostic apparatusincludes a case, a piezoelectric object, a sound absorbing layer, anacoustic matching layer and a sound lens. The case may form an exteriorof the probe. The piezoelectric body may be provided at an inside of thecase and may generate an ultrasonic wave. The sound absorbing layer maybe provided at a rear surface of the piezoelectric object and mayprevent the ultrasonic wave from being delivered to a rear portion ofthe piezoelectric object. The acoustic matching layer may be provided ata front surface of the piezoelectric object and may deliver thegenerated ultrasonic wave to a subject by matching a sound impedance ofthe piezoelectric object with a sound impedance of the subject. Thesound lens may be provided at a front surface of the acoustic matchinglayer and may concentrate the generated ultrasonic wave and radiate theconcentrated ultrasonic wave toward the subject. The sound lens mayinclude a concave portion which facilitates performance of a diagnosisalong a curved surface of the subject.

The probe may further include a moving layer which is provided at a rearsurface of the sound absorbing layer and which changes a radius ofcurvature of the sound lens, and a driving member which causes themoving layer to move.

The moving layer may include compressed gas.

The moving layer may include a liquid and a film surrounding the liquid.

The probe may further include a cover portion which is provided at afront surface of the sound lens and which makes contact with a skin ofthe subject. The cover portion may include a concave portion having asame shape as a shape of the concave portion of the sound lens.

The probe may further include a pad which is protrudingly provided at afront surface of the cover portion and which ejects air from a contactsurface at which the probe makes contact with the skin of the subject.

The pad may be integrally attached to the sound lens.

The pad may be provided at an outer side of a base member that isdetachably mounted to the cover portion.

The driving member may be positioned at a rear surface of the movinglayer, and may include a piston which causes the moving layer to move.

Each of a radius of curvature of the piezoelectric object and a radiusof curvature of the sound absorbing layer may vary as the moving layeris moved by using the piston, and the concave portion may flatten as themoving layer is moved.

The driving member may further include a motor which is coupled to thepiston and which drives the piston in a full automatic manner.

Each of a radius of curvature of the piezoelectric object and a radiusof curvature of the sound absorbing layer may vary when the piston isdriven in a full automatic manner such that the moving layer is moved,and the concave portion may flatten as the moving layer is moved.

The cover portion may include a flexible material.

In accordance with another aspect of one or more exemplary embodiments,a probe for use in conjunction with an ultrasonic diagnostic apparatusis provided. The probe includes a cover portion which forms an exteriorof the probe and a transducer which is provided at an inner side of thecover portion and which reciprocally changes an electrical signal and asound signal. A first surface of the transducer may include a concaveportion which facilitates performance of a diagnosis along a curvedsurface of a subject, and a second surface of the transducer may includea moving layer which changes a radius of curvature of a portion of thetransducer which makes contact with the subject.

The probe may include a pad which is attached to a front surface of thecover portion and which ejects air from a contact surface at which theprobe makes contact with a skin of the subject.

The probe may further include a base portion which is detachablyprovided at the cover portion.

A pad may be provided at an outer side of the base portion. The pad mayeject air from a contact surface at which the probe makes contact with askin of the subject.

The cover portion may include a concave portion having a same shape as ashape of the concave portion of the first surface of the transducer.

The probe may further include a driving member which is positioned at arear surface of the moving layer and which causes the moving layer tomove.

The driving member may include a piston which causes the moving layer tomove, and a motor which is coupled to the piston and which drives thepiston in a full automatic manner.

As described above, exemplary embodiments capable of facilitatingperformance of a diagnosis of a medical condition relating to a subjectat a single scan in a case in which a medical condition relating to amuscular skeletal system (for example, shoulders and knees) is beingdiagnosed.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of exemplary embodiments,taken in conjunction with the accompanying drawings of which:

FIG. 1 is a drawing which illustrates a front surface of an ultrasonicdiagnostic apparatus, in accordance with an exemplary embodiment.

FIG. 2 is a perspective view which illustrates a probe which isconfigured for use in conjunction with an ultrasonic diagnosticapparatus, in accordance with an exemplary embodiment.

FIG. 3 is a perspective view which illustrates a cross section A-A asindicated in FIG. 2.

FIG. 4 is a cross-sectional view which illustrates a cross section A-Aas indicated in FIG. 2.

FIG. 5 is a perspective view which illustrates a probe which isconfigured for use in conjunction with an ultrasonic diagnosticapparatus, in accordance with another exemplary embodiment.

FIG. 6 is a cross-sectional view which illustrates a cross section B-Bas indicated in FIG. 5.

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary embodiments, examplesof which are illustrated in the accompanying drawings, wherein likereference numerals refer to like elements throughout.

FIG. 1 is a drawing which illustrates a front surface of an ultrasonicdiagnostic apparatus, according to an exemplary embodiment. A probeaccording to one or more exemplary embodiments is not only used inconjunction with an ultrasonic diagnostic apparatus, but also is used inconjunction with various ultrasonic transducer apparatuses, and a probefor use in conjunction with an ultrasonic diagnostic apparatus will bedescribed hereinafter as an example.

As illustrated in FIG. 1, an ultrasonic diagnostic apparatus 1 accordingto an exemplary embodiment is provided with a probe 10 having varioustypes thereof for use in conjunction with the ultrasonic diagnosticapparatus. The probe 10 radiates an ultrasonic wave toward a subject andreceives an echo of the ultrasonic wave from the subject. The ultrasonicdiagnostic apparatus 1 is further provided with a control button 3, anda display apparatus 2 installed thereto, and includes a body 5 which isused for generating an image of the subject. The probe 10 for use inconjunction with the ultrasonic diagnostic apparatus 1 is connected tothe body 5 by a cable 11 and a connector 6 that are integrally connectedto the probe 10. At a lower side of the body 5, a supporting portion 7which supports the ultrasonic diagnostic apparatus 1 is provided. Thesupporting portion 7 may include a transporting medium, such as, forexample, wheels, which transporting medium is used for moving theultrasonic diagnostic apparatus 1.

FIG. 2 is a perspective view which illustrates a probe which isconfigured for use in conjunction with an ultrasonic diagnosticapparatus, according to an exemplary embodiment, FIG. 3 is a perspectiveview which illustrates a cross section A-A as indicated in FIG. 2, andFIG. 4 is a cross-sectional view which illustrates a cross section A-Aas indicated in FIG. 2.

As illustrated in FIGS. 2, 3, and 4, the probe 10 for use in conjunctionwith the ultrasonic diagnostic apparatus 1 includes a case 12 whichforms an exterior of the probe 10 and a cover portion 13 which isprovided at an upper side of the probe 10. An upper side of the case 12is open, and the cover portion 13 is coupled to an upper end of the case12 which is open. An administrator may perform a test by holding thecase 12 of the probe 10 and causing the cover portion 13 to make contactwith the subject.

At an inner side of the cover portion 13, a transducer is provided. Thetransducer includes a piezoelectric object 17, an acoustic matchinglayer 16, a sound lens 15, and a sound absorbing layer 18.

The sound lens 15, the acoustic matching layer 16, the piezoelectricobject 17, and the sound absorbing layer 18 are arranged in an order ofappearance as the above from a front surface portion at which thecontact is made with the subject.

The piezoelectric object 17 is positioned at an inner side of the coverportion 13, and is attached at a front surface of the sound absorbinglayer 18. Electrode portions (not shown) are provided at both sides ofthe piezoelectric object 17. The piezoelectric object 17 converts anelectrical signal to an ultrasonic wave, which is a sound signal, inorder to release the ultrasonic wave into air, and converts theultrasonic wave, which is reflected from the air, to an electricalsignal, in order to transmit the electric signal to an apparatus.

The piezoelectric object 17 is configured to generate an ultrasonic waveby using a resonance phenomenon, and may be formed by using at least oneof a ceramic from a lead zirconate ceramic material, such as, forexample, lead zirconate titanate (PZT), a PNZT single crystal which ismade of the solid solution of zinc niobate and titanate, and a PMZTsingle crystal which is made of the solid solution of magnesium niobateand titanate.

In a case of the electrode portions (not shown) formed at both sides ofthe piezoelectric object 17, the electrode portions may be formed byusing a metal which has a relatively high conductivity, such as, forexample, at least one of gold, silver, and copper, or by using graphite.

The acoustic matching layer 16 is installed at a front portion of thepiezoelectric object 17. The acoustic matching layer 16 matches thesound impedance of the piezoelectric object 17 with the sound impedanceof the subject, so that the ultrasonic wave signal generated by thepiezoelectric object 17 may be efficiently delivered to the subject.Accordingly, the acoustic matching layer 16 is configured to have amedian sound impedance value with respect to the sound impedance of thepiezoelectric object 17 and the sound impedance of the subject.

The acoustic matching layer 16 may be formed by using a glass materialor a resin material. The acoustic matching layer 16 may include aplurality of acoustic matching layers which have different respectivematerials so that the sound impedance may be gradually changed from thesound impedance of the piezoelectric object 17 to the sound impedance ofthe subject.

The sound absorbing layer 18 is disposed at a rear portion of thepiezoelectric object 17. The sound absorbing layer 18 restrains a freevibration of the piezoelectric object 17 in order to reduce the width ofthe pulse of the ultrasonic wave, and blocks the ultrasonic wave whichwould otherwise be transmitted to a rear portion of the piezoelectricobject 17, thereby preventing a distortion of an resultant image.

A printed circuit board (PCB) (not shown) may be positioned in betweenthe sound absorbing layer 18 and the piezoelectric object 17. The PCB isprovided in order to reciprocally change the electrical signal and theultrasonic wave signal generated by the electrode portion (not shown).The PCB may be arranged vertically with respect to a side surface of thepiezoelectric object 17 having a largest surface area, and the soundabsorbing layer 18 may be arranged such that the PCB and the soundabsorbing layer 18 are stacked up against each other. The PCB mayfurther include a structure, such as, for example, a flexible printedcircuit board (FPCB) which is provided in conjunction with a signal,which structure is capable of supplying electrical energy.

The sound lens 15 is disposed at a front portion of the acousticmatching layer 16. The sound lens 15 is configured to concentrate theultrasonic wave signal, which proceeds to a front of the sound lens 15,to a particular position. The sound lens 15 includes a concave portion15 a which facilitates performance of a diagnosis along a curved surfaceof the subject.

The cover portion 13 may also be provided with a concave portion 13 awhich has a same shape as a shape of the concave portion 15 a of thesound lens 15. However, in a case in which the cover portion 13 isformed by using a flexible material, the cover portion 13 does not needto be provided with the concave portion 13 a, because the flexibility ofthe material ensures that the probe 10 remains fully capable offacilitating performance of a diagnosis on the surface of the subject.

In addition, at a rear surface of the sound absorbing layer 18, a movinglayer 19 which changes the radius of curvature of the sound lens 15 withrespect to making contact with the subject is provided. At a rear of themoving layer 19, a driving member 20 is provided, which driving member20 causes the moving layer 19 to move in order to change the radius ofcurvature of the sound lens 15.

The moving layer 19 may be provided, for example, as pressured gas. Themoving layer 19 may be formed by using a liquid, and in this case assuch, the moving layer 19 includes a film which surrounds the liquid.The film which is included within the moving layer 19 may be formed byusing a thin film so that the shape of the moving layer 19 may bechanged. In addition, the liquid which is surrounded by the film may beformed by using an oil film having viscosity and flexibility.

The driving member 20, which is positioned at a rear portion of themoving layer 19, may include a piston 21 which causes the moving layer19 to move. The piston 21 is connected to a control member, such as alever (not shown) which is provided at an outer side of the case 12, sothat an administrator may manually control the position of the piston21, and accordingly, the moving layer 19 may be moved. Each of a radiusof a curvature of the piezoelectric object 17 and a radius of acurvature of the sound absorbing layer 18 varies as the moving layer 19is moved by the piston 21, and accordingly, a radius of a curvature ofthe sound lens 15 also varies. Thus, the shape of the concave portion15A may flatten, such that a concave-type probe may be deformed to beshaped similarly as a linear-type probe.

In addition, the piston 21 may be operated in a full automatic manner bybeing connected to a motor 25. In this case, an administrator operatesthe motor 25 by using a control member, such as a button (not shown)positioned at an outer side of the case 12, and accordingly, the piston21 may be operated. A structure, such as a crank shaft 23, a crank arm24, and/or a connecting rod 22, may be further provided for translatinga rotational movement of the motor 25 to a reciprocal movement of thepiston 21. In addition, a reduction gear 26 may be provided forcontrolling a speed of the rotation of the motor 25.

According to an exemplary embodiment, the motor 25 is connected to thereduction gear 26, and the reduction gear 26 is connected to theconnecting rod 22 through the crank shaft 23. The rotational movement ofthe crank shaft 23 is translated to the reciprocal movement of thepiston 21 through the connecting rod 22. A crank journal may be coupledto the crank shaft 23 in order to fix the crank shaft 23. One side ofthe connecting rod 22 is connected to the crank shaft 23 while the otherside of the connecting rod 22 is coupled to the piston 21. Accordingly,the driving force of the motor 25 is delivered to the piston 21, and asthe piston 21 moves, the moving layer 19 may also be moved, and based onthe movement of the moving layer 19, the radius of curvature of thetransducer having the sound lens 15 varies. The variations of the radiusof curvature of the piezoelectric material 17 and radius of curvature ofthe sound absorbing layer 18 follow the movement of the moving layer 19,and the variation of the radius of curvature of the sound lens 15remains the same, regardless of whether the piston 21 operates manuallyor automatically. Accordingly, in a case in which a body structure ofthe subject is different than the body structure of a previous subject,the radius of curvature of the sound lens 15 may be changed to a certaindegree, and thus a performance of a diagnosis by using the same probe 10in conjunction with the ultrasonic diagnostic apparatus 1 may bepossible.

In addition, at a rear surface of the driving member 20, a strain reliefapparatus (not shown) which connects the cable 11 to the probe 10 isprovided. The strain relief apparatus is configured to protect the cable11 from an impact applied to the cable 11, and is capable of restrainingthe impact, which is caused by a curvature of the cable 11, which wouldotherwise be applied to an outer side of the probe 10 and to a contactpoint of the cable 11.

According to an exemplary embodiment, a pad 14 is integrally attached tothe cover portion 13. Because an ultrasonic wave does not penetratethrough a bone and air, in a case in which an ultrasonic diagnosis isbeing performed, an ultrasonic wave mediating material is applied inbetween the body of the subject and the probe 10. In particular, amiddle layer which is included within the ultrasonic wave mediatingmaterial is needed so that the ultrasonic wave radiated toward an insideof a human body is evenly spread and then the wave signal is reflectedback toward the body 5.

In a case in which the conventional ultrasonic wave mediating materialis of a liquid type, most of the substance thereof is formed withmoisture, and thereby becomes evaporated or displaced to a separateportion of the skin of a subject after a certain period of time elapsesafter the mediating material has been applied on the skin of the subjectand the probe 10 has been operated thereon, and thus a continuous usagethereof is not possible. In addition, the conventional ultrasonic wavemediating material of a liquid type is less useful for obtaining animage of an organ which is located on a curved portion or at a positionwhich is relatively proximate to a curved portion of the body of thesubject.

Thus, in an exemplary embodiment, a pad which has the ultrasonic wavemediating material applied thereto by using a cross-linked polymer isused instead. However, in a case of the pad, an administrator must carrythe pad separately, and in a case of performing a diagnosis, the padmust be held with one hand while the other hand is used for operatingthe probe 10.

In order to remove the above constraints, the probe 10 according to anexemplary embodiment is provided with the pad 14, which has theultrasonic wave mediating material applied thereto by using across-linked polymer, mounted thereto for use. According to an exemplaryembodiment, the pad 14 is integrally attached to the sound lens 15, andthe pad 14 protrudes through an opening portion of the cover portion 13.In addition, the pad 14 may be attached to a front surface of the coverportion 13. Thus, the pad 14 may be placed into direct contact with theskin of the subject, and accordingly, a test may be performed withoutusing a separate ultrasonic wave mediating material. The foregoingaspect as such may provide an advantage in view of a recent trend inwhich an administrator performs a diagnosis relating to the subjectwhile simultaneously performing other activities. Further, the foregoingaspect may also provide an advantage relating to an improvement in acompactness of the diagnostic apparatus.

FIG. 5 is a perspective view which illustrates a probe configured foruse in conjunction with an ultrasonic diagnostic apparatus, according toanother exemplary embodiment, and FIG. 6 is a cross-sectional view whichillustrates a cross section B-B as indicated in FIG. 5.

As illustrated in FIGS. 5 and 6, a probe 30 for use in conjunction withan ultrasonic diagnostic apparatus according to another exemplaryembodiment further includes a base member 40 which is detachably mountedto a cover portion 33. The probe 30 also includes a cable 31, which issimilar to the cable 11 described above with respect to FIG. 2; aconcave portion 33 a of the cover portion 33, which is similar to theconcave portion 13 a of the cover portion 13 described above withrespect to FIG. 4; an acoustic matching layer 36 which is similar to theacoustic matching layer 16 described above with respect to FIGS. 3 and4; and a piezoelectric object 37 which is similar to the piezoelectricobject 17 described above with respect to FIGS. 3 and 4. A furtherdetailed description of these items will therefore be omitted forbrevity.

As illustrated in FIGS. 5 and 6, a sound lens 35 of the probe 30 mayfurther include a concave portion 35 a. In addition, a moving layer 39which changes the radius of curvature of the sound lens 35 may beprovided at a rear surface of an sound absorbing layer 38, and a drivingmember 20 may be provided at a rear surface of the moving layer 39 forcausing the moving layer 39 to move. The base member 40 may include aconcave portion 41 which has a shape which is similar to a shape of theconcave portion 35 a of the sound lens 35, and the concave portion 41 ofthe base member 40 facilitates performance of a diagnosis by increasinga contact area with respect to the skin of the subject.

The base member 40 may be provided with a guide portion 42 so that thebase member 40 may be inserted into the probe 30. The guide portion 42extends from the concave portion 41 of the base member 40, and may beprovided in a shape which corresponds to a case 32 and the cover portion33 such that the guide portion 42 may be inserted into the case 32 andthe cover portion 33 of the probe 30. In addition, the base member 40may be formed by using an elastic material, and the elasticity of thematerial may enable the base member 40 to be inserted into the probe 30,although a size of the probe 30 may vary.

The concave portion 41 of the base member 40 may be provided with a pad(not shown), and the pad makes contact with the skin of the subject.Because the pad must adhere as closely as possible to the skin of thesubject in order to minimize a loss of energy from the ultrasonic wave,the concave portion 41 of the case member 40, which is positioned inbetween the pad and the sound lens 35, may be provided such that athickness of the concave portion 41 is as thin as possible.

The pad is provided at the base member 40, and the base member 40 isinserted into the probe 30 at the time of performing a diagnosis. In acase in which the base member 40 is provided with the pad, the basemember 40 may be detached to be stored separately when the probe 30 isnot being used.

Although a few exemplary embodiments have been shown and described, itwill be appreciated by those skilled in the art that changes may be madein these exemplary embodiments without departing from the principles andspirit of the present disclosure, the scope of which is defined in theclaims and their equivalents.

What is claimed is:
 1. A probe for an ultrasonic diagnostic apparatus,the probe comprising: a case; a piezoelectric object provided at aninterior portion of the case and configured to generate an ultrasonicwave; a backing layer provided at a rear portion of the piezoelectricobject and configured to block the generated ultrasonic wave frompropagating through and out of a rear portion of the backing layer; anacoustic matching layer provided at a front portion of the piezoelectricobject and configured to match a sound impedance of the piezoelectricobject with a sound impedance of a subject; an acoustic lens provided ata front portion of the acoustic matching layer and configured toconcentrate the generated ultrasonic wave and facilitate a propagationof the concentrated ultrasonic wave signal toward the subject; and a padwhich is provided at a base member that is detachably mounted to a frontportion of the acoustic lens, the pad being configured to directlycontact with a skin of the subject, wherein the acoustic lens comprisesa concave portion configured to facilitate a performance of a diagnosiswith respect to the subject along a curved surface of the subject, andwherein the concavity of the concave portion of the acoustic lens is aconcavity with respect to the skin of the subject.
 2. The probe of claim1, wherein the pad is provided on a front portion of the base member. 3.The probe of claim 1, wherein the base member is provided at an insidethereof with an opening, and the pad is accommodated in the opening. 4.The probe of claim 1, wherein the base member has a square shape, in amiddle portion of which an opening is provided, and the pad isaccommodated in the opening.
 5. The probe of claim 1, wherein the padhas a same shape as a shape of the concave portion of the acoustic lens.6. The probe of claim 2, wherein the base member comprises a concaveportion that has a shape that corresponds to a shape of the concaveportion of the acoustic lens.
 7. The probe of claim 6, wherein the padhas a concave shape to correspond with the concave portion of theacoustic lens.
 8. The probe of claim 5, wherein the pad is provided onthe concave portion of the base member.
 9. The probe of claim 6, whereinthe pad has a same shape as the shape of the concave portion of the basemember.
 10. The probe of claim 1, wherein the base member including thepad is detachable from the probe.
 11. The probe of claim 6, wherein thebase member further comprises a guide portion that extends from theconcave portion of the base member such that the base member isinsertable into the case.